Paper-pulp strainer



(No Mede-if) 2 sheets-sheet 1I M. M. SLO-AN. PAPER PULP STRAINBR.

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- 1v1. SLOAN. v .l PAPER BU'LP STRAINBR. d No. 514,736. 'Patented Peb. 13,1894.

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PATENT UFFICE.

MAURICE`M. SLOAN, OF PHILADELPHIA, PENNSYLVANIA.

PAPER-PU LP STRINER.

SPECIFICATION forming part of Letters Patent No. 514,736, dated February 13, 1894.

Application filed April 4, 1893.

To @ZZ whom it may concern:

Be it known that I, MAURICE M. SLOAN, a citizen of the United States, and a resident of the city and county of-Philadelphia, State of Pennsylvania, have invented certain new and useful Improvements in Paper-Pulp Strainers, of which the following is a specification.

My invention relates to improvements in machines for straining or evening paper pulp, and the object of my invention is to furnish an improvement in the devices for reciprocating the suction plate or the straining box which holds the pulp which will enable this plate or box to be operated at a greater speed than is possible with the devices at present used, and which at the same time will be almost or entirely free from the violent jar and vibration caused by the movements of the present reciprocating devices.

Paper pulp after havingbeen digested and mixed, and before passing to the paper making machine, is passed through a sieve to intercept and break up particles of the pulp which may stick together and form lumps which would make-inequalities in the papel'.

In some cases the sieve forms the bottom of a box which is rapidly reciprocated vertically; in others the sieve and box are stationary, and a suction plate is placed beneath the sieve which is reciprocated vertically, the suction caused by the plate rapidly leaving the sieve drawing the thoroughly mixed pulp through the sieve and -breaking up or leaving the lumps upon its top, while the compression of air between the suction plate and sieve, when the former rapidly approaches the latter, causes the pulp upon 'the sieve to be raised and cleans and prevents the sieve from becoming choked.V The devices heretofore used for operating thesieves or the suction plates, consist usually of cams or tappets which engage and lift the sieves or suction plates, which then fall by gravity, or they consist of an arrangement of cams or tappets which lift these devices, and of springs which draw them down violently after the cams have released them. These devices are objectionable in that the number of movements performed by the sieves or suction plates in a given time are comparatively limited, and principally in that the jar caused by the falling sieves or` Serial N o. 469.020. (No model.)

suction plates is so great as to quickly wear out the machine, while the noise produced by the machine while in motion is exceedingly objectionable.

My improvement in devices for operating machines of this nature consists of two cams fast to and driven by a shaft and which engage friction rollers, which are carried by a yoke which passes around said shaft and cams, and which is connected to the sieve box or to the suction plate. The friction rollers 'are placed oneabove, and the other beneath, the shaft, and the cams are so placed and shaped that the face of eachcam is always in contact .with its roller, that is, one cam is the negative of the other or positive cam. As the shaft is revolved, the cams, owing to their shape, cause, through the friction rollers, the yoke and its connected parts to be rapidly reciprocated.

yIn the accompanying drawings forming part of this specification, and in which similar letters of reference indicate similar parts throughout the several views--Figure l, is a sectional end elevation through a paper pulp evening machine showing myinvention, said section being online 1-2, Fig. 2. Fig. 2, is a side elevation of part of a paper pulp machine partly in section, showing my reciprocating device; Fig. 8, an end elevation of my reciprocating devices, the front plate or cover of the yoke being removed, and, Fig. 4, is a central sectional side elevation of Fig. 3.

A, is a box into which the paper pulp is placed and the bottom B of which is formed by a sieve.

C, is a suction plate placed beneath the box A. D, are gutters through which the pulpv after it passes through the sieve runs to the paper making machine. These parts are well known and will need no further description herein.

E, is a shaft carried in suitable bearings F,

loo

the latter of which engages cam L at its bottom. The roller M is carried by a shaft() held by the yoke K. The roller N is carried by a shaft P which is carried by a box R which is placed. Within the yoke and Which is supported by a spring S which may be formed of rubber or metal.

T is a plate upon which spring S rests and U are set screws passing up through the bottom of yoke K by means of which, plate T, the tension of the spring or springs may be regulated.

V, is a front plate or cover for the yoke K.

W, are adjustable collars on shaft E, the purpose of which is to keep the yoke K in place.

It will be observed that the hole in yoke K through which shaft E passes, is of a greater diameter than t-he shaft in order to permit the reciprocation of the yoke by the revolution of the cams.

The operation of the device is as follows: The revolution of shaft E drives cams H, L, which are carried by this shaft, and the faces of which are so shaped that each cani will always be in contact with its own roller M, N; the revolution of the cams causes the yoke K to be reciprocated and as this yoke is conuected to the sieve box, this plate or box is reciprocated with it.

With my arrangement the suction plate or sieve box can be run at a higher speed than is possible with the old form of reciprocating devices and with much less jar and noise.

lf desired the lower part of the yoke may be filled with oil to lubricate the several movingr parts of the device.

Having thus described my invention, I claiml. The combination with the reciprocating part of a paper pulp strainer, ot' a shaft, a positive and a negative cam carried upon said shaft, a yoke surrounding said shaft and cams and connected to the reciprocating part of said pulp machine, a friction roller carried by a shaft carried by said yoke and engaging one of said cams upon its top, a box or bearingin the lower part ofsaid yoke, a spring for supportingr said box, a friction roller carried on a shaft journaled in said box and en- ,flaggingr the other cam at its bottom and means for adjusting1 the tension of said spring.

2. The combination with the shaft, positive and negative cams carried by said shaft, yoke, friction rolls carriedl by said yoke and engaging said cams, and the reciprocating part of a paper pulp strainer, of the front plate or cover for said yoke and the adjustable collars on said shaft adapted to keep in place and guide said yoke during its movements.

MAURICE M. SLOAN.

Witnesses:

M. C. MINTZER, CHARLES H. MINTZER. 

